Brake lock



s. M. MCDONNELL 20309753 BRAKE LOCK Filed Oct. 5, 1954 Feb. M, i936,

fdmwzjyrbezgmm Bf M em/Mara.

' ATTORNEY Patented Feb. 1l, 1936 UNITED STATES PATENT OFFICE BRAKE LGCK Samuel-M. McDonnell, Neenah, Wis.

Application October 3, 1934, Serial No. 746,719

1 Claim. (Cl. 18S-265) This invention relates to brake locks for automobiles and has for the primary object the provision of a device of this character which may be easily mounted to an automobile and connected to the service brake thereof whereby the brake may be secured in brake applying position whenever desired and which will not interfere with the ordinary operation of the brakes when the device is in position to free the brakes.

Another object of the invention is the provision of means for automatically rendering the electrical stop signal of the automobile inoperative when the brake is applied by this invention.

With these and other objects in view this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which Figure 1V is a fragmentary vertical sectional view showing a portion of an automobile -With a brake lock applied thereto and connected to the brake operating means of the brakes of the automobile.

Figure 2 is a fragmentary view showing the connection of my invention to the brake operating medium. v A y Figure 3 is a diagrammatical view showing the circuit of an electricalstop signal of the automobile with the switchconnected therein and operated through the. brake lock forming the subject matter of ,the present invention.

Referring in detail to the drawing. the numeral I indicates a fragmentary portion of the body of an automobile and the numeral 2 indicates the usual foot pedal for operating the service brakes ofthe automobile pivotaily mounted, as shown' at 3, and provided with an arm l pivotally connected to the brake rod 5 by a bolt 6 tting a specially constructed clevis 1 on the brake rod. The clevis 1 is provided with an extension inthe form of 45 spaced kslotted-arms l having connected thereto by means of a bolt 9 a rod Il including sections adjustably connected by a turnbuckleV Il. One of the sections of the rod ,I0 is of a flexible construction operating through a flexible housing Il secured to the Iautomobile I. A tubularsleeve Il is connected to the ilexible section of the rod Il and is internally screw threaded to receive the screw threaded end of an'operating bar I5 slidably mounted in a housing I6 mounted to the body of the automobile and projecting through the usual instrument board and equipped with a handle I1. The bar I5 is providedwith a series of teeth i8 adapted to engage with a keeper I 9 forming an integral part of thehousing I6. A spring 20 engages the bar for normally positioning the latter so that the teeth thereof will engage with the keeper I9. A pull on the handle II will bring about applying of the service brakes of the automobile and .bringing a tooth on the bar I5 in engagement with the keeper I9 the bar will be held against releasing ofl the service brakes. Thus it will be seen that the operator when leaving the vehicle may pull upon the lhandle Il and apply the service brakes and on returning to the automobile all that is necessary for the operator to release the service brake is to disengage the tooth of the bar from the keeper I9 and move the bar I5 inwardly. A slight upward movement of the handle i1 will disengage the teeth from the keeper.

The character 2I indicates the electric circuit I of the electrical stop signal of the automobile and interposed in this circuit is a switch 22 connected tothe bar I5 by a spring 23. The bar'I5 when moved inwardly to release the brakes closes the Yswitch 2 2 so that the stop signal Vmay operate in the ordinary manner. However, when the bar I5 is pulled outwardly to apply the service brakes the switch 22 .is actuated and breaks the electric t circuit 2| to the stop signal.

Havingdescribed the invention,'I claim:

rack bar,' 'a keeper to be engaged by said rack `bar for. holdingthe latter in adjusted positions,

a rod including adjustably connected sections and one of said sections being of Iflexible construction and connected to the rack bar, a flexible housing Vfor supporting theilexible sectionof said rod,

one position of therack-bar without interference from the latter and permit operation' of the brake riggingto apply brakes by other positions of said rack bar. v SAMUEL McDONN/ELL. 

